I bought one of these:
http://www.controlbyweb.com/webrelay-quad/http://www.isourcecctv.com/images/products/detail/X320_front.1.gifAnd it works great. I think I paid $140 for it, and it works great for my LTC miners. After configuring it, I just hook up the normally open pins on each relay to the reset pins on each miner's motherboard. If a miner isn't responding, I go to the dynamic DNS hostname I set up, it's port forwarded on my router, and pow, I've got a web based gui with buttons to restart my miners.

Now, I won't be in a situation again where I go on a two-week vacation and one of the miners locks up on day two.
